I love this song! I first heard it on "Full House" starring Rain. It's such a cute song! I even learned how to sing it!
Here's the Korean:
곰세마리가 한 집에 있어
아빠곰, 엄마곰, 아기곰
아빠곰은 뚱뚱해
엄마곰은 날씬해.
아기곰은 너무 귀여워
으쓱! 으쓱! 잘한다.
There are three bears in a house,
Father bear, Mommy bear, baby bear!
Daddy bear is fat,
Mommy bear is slim,
Baby bear is too cute!
Shrug! Shrug!* You are doing well!